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(No Model.)

2 Sheets-Sheet 1.

D. KELLY & W. H. HOFFMAN.

STEAM GENERATOR.

No. 257,134. Patented 'Apr.Z5.188Z.

Izzrezz [or (No Model.)

2 Sheets-Shet 2. D.;KELLY & W. H. HOFFMAN.

I STEAM GENERATOR. No. 257,134. Patented Apr. 25, 1882.

%ZZ/zam y- 4 [/2 e22 207'- UNITED STATES PATENT OFFICE.

DANIEL KELLY, OE PHILADELPHIA, PENNSYLVANIA, AND ILLlAM H.

HOFFMAN, OF PASSAIO, NEW JERSEY, ASSIGNORS OF ONE-THIRD TO' WALTER K.LUDYVIG, OE PHILADELPHIA, PENNSYLVANIA.

STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent No. 257,134, dated April25, 1882,

Application filed November 4, 1881. (No model.)

To all whom it may concern:

' Be it known that we, DANIEL KELLY, of Philadelphia, in the county ofPhilade] phia and State of Pennsylvania, and WILLIAM H. HOFF- MAN, ofPassaic, in'the county of Passaic and State of New Jersey, have inventedcertain new and useful Improvements in Steam-Generators,of which thefollowing is a specification.

Our invention relates to that class of steamgenerators in which a numberof upright watertubes are arranged below a water and steam drum, withwhich they communicate, and more particularly to those generators inwhich the said tubes communicate at their lower ends with a water andsediment drum. In such generators the upright tubes are frequentlyformed or provided with outwardly-projectin g flanges at their ends,through which rivets or bolts are passed to secure them to the water andsteam drum and the water and sediment drum, and the externaljoints thusformed are liable to be destroyed or impaired by the great heat to whichthey are exposed.

The object of our invention is to obviate this difficulty and to make amore permanent connection between the tubes and drum or drums; and tothis end the invention consists in the combination,in a steam-generator,of a water 0 and steam drum, a number of upright tubes, preferablytapering down ward, and hollow sad dles or head-pieces, into which theupper ends of said tubes are expanded, and which have inwardly-projecting flanges, through which are 5 inserted rivets or bolts for securing thesaid saddles or head-pieces to the said drum. The flanges of the saddlesor head-pieces are not exposed to the fire, but are always covered bywater, and are therefore more durable.

The invention also consists in the combination, in a steam-generator,with the water or steam drum, the tubes, and their saddles orhead-pieces, of a water and sediment drum, and a number of hollowsaddles or foot-pieces, into which the lowerezids of the tubes areexpanded, and which have inwardly-projecting flanges, whereby they aresecured to the water and sediment drum in the same manner as are theupper saddles or head-pieces.

In the accompanying drawings, Figure 1 rep- 5o resents a verticallongitudinal section of asteamgeneratorembodyingourinvention.Fig.2represents a transverse vertical section thereof on the dotted linem 00, Fig. 1; and Fi 3 represents a section of the steam and water drum,a saddle or head-piece, and the upper portion of one of the tubes, upona larger scale than in Fig. 2.

Similar letters of reference designate corre. sponding parts in allthefigures. A designates the furnace, a'the grate, and

B the bridge-wall of the generator.

0 designates a water and steam drum, extending over the furnace andforward as far as is necessary to give the necessary capacity of thegenerator. v

D designates a water and sediment drum, arranged immediately below thedrum 0.

E designatesa numberofupright tubes, whichextendfronrthedrumDtothedrumO,andwhich 7o communicate attheir lower endswith the drum D and at their upper ends with the drum 0. The tubes areintended to afford a free circulation of water from the water and steamdrum 0 downward, and of steam upward from. the interior surfaces of thetubes to the d rum (J; and in order to increase their effectiveness thetubes E are tapered from their upper ends downward, so that the steamformed upon their interior surfaces may have opportunity to escape 8o-upward without interference from the water in the tubes. The tubes Eare not connected directly to the drums G and D, as is usual ingenerators of this class, but they are connected at their upper ends tohollow saddles or headpieces F and at their lower ends to similar hollowsaddles or foot-pieces, G. The upper saddles or headpieccs, 1 havetube-holes bin their under sides, and into these holes the up per endsof the tubes are expanded, and the lower ends of the tubes are expandedinto the holes 0 in the lower saddles or foot-pieces, G.

Both the saddles or head and foot pieces F G are provided with flanges dc, which project inward, and are curved to correspond to the externalsurfaces of the drums G D, and they are secured to said drums by rivetsor bolts inserted through said flanges. The flanges are not exposed tothe fire, and hence there is no liability of the heads of the rivets orbolts being burned off and the joints leaking.

The manner of forming the joint between the upper saddles orhead-pieces, F, and the steam and water drum 0 is shown most clearly inFig. 3; and it will be understood that the joints between the lowersaddles or foot-pieces and the water and sediment drum D are formed inprecisely the same manner. From Fig. 3 it will be seen that the flange don the head-piece F is always covered by water, as also are the rivetss, and hence the 'rivets cannot burn off and thereby impair the joint.

The head and foot pieces or saddles F G may consist of steel castings,as they may then be made of sufficient strength without undue thicknessand weight. I

In order to increase the effectiveness of the generator and afl'ord theheated products of combustion free access to all the tubes, they arepreferably arranged in staggered relation to each other-that is, inthree rows, those in the center row being intermediate between those inthe side rows.

- We are aware that the water-tubes of steamgenerators have beenconnected with water and steam drums and with water and sediment drumsby flanging the tubes externally and riveting them thereto, andtherefore do not claim any such construction. In our generator the tubesare secured in the head and foot pieces or saddles by expanded joints,which are not liable to be burned out, and the flanged joints betweenthe head and foot pieces or saddles and the drums and the rivetssecuring them are absolutely protected by being always eovered withwater.

What we claim as our invention, and desire to secure by Letters Patent,is

1. In asteam-generator, the combination of a water and steamdrum,(),,the hollow saddles or head-pieces F, provided with internalflanges,

d, riveted or bolted to said drum, and tubes E,

expanded into said saddles or head-pieces, substantially as specified.

2. In a steam-generator, the combination of a water and steam drum, 0, awater and sediment drum, D, hollow saddles or head and foot pieces F G,provided with internal flanges, d e, riveted or bolted to said drums,and tubes .E, expanded into said saddles or headand foot pieces,substantially as specified.

DANIEL KELLY. WILLIAM H. HOFFMAN. Witnesses:

FREDK. HAYNES, CHANDLER HALL.

